Installed on another workstation succesfully, but getting this error when running sup-config

/usr/lib/ruby/2.1.0/rubygems/dependency.rb:298:in `to_specs': Could not find 'highline' (>= 0) among 18 total gem(s) (Gem::LoadError)
from /usr/lib/ruby/2.1.0/rubygems/specification.rb:1295:in `block in activate_dependencies'
from /usr/lib/ruby/2.1.0/rubygems/specification.rb:1284:in `each'
from /usr/lib/ruby/2.1.0/rubygems/specification.rb:1284:in `activate_dependencies'
from /usr/lib/ruby/2.1.0/rubygems/specification.rb:1266:in `activate'
from /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_gem.rb:54:in `gem'
from /usr/bin/sup-config:22:in `<main>'